PRINCETON PROFESSOR GIVES PUBLIC LECTURES

A second series of free public lectures will be given at the Lowell Institute, in Huntington Hall, 491 Boylston Street, Boston, on Mondays, Wednesdays, and Fridays, in the weeks of February 1 to 14. The lectures, which will begin at 8 o'clock in the evening are to be given by H. N. Russell, professor of astronomy at Princeton, and honorary D. Sc. at Harvard, and will be under the general heading of "The Physics of the Stars".

The subjects of the six lectures are as follows: 1. "Study of Starlight: brightness, colors, spectra"; 2. "Temperatures, Dimensions, and Masses of the Stars: relations between mass and luminosity"; 3. "Variable and Temporary Stars: relation between period and luminosity"; 4. "Interpretation of Stellar Spectra: ionization and consequences, stellar atmospheres"; 5. "The Same, continued"; 6. "The Interior of a Star: problems of constitution and Evolution".

Professor Russell has been a research associate of the Mount Wilson Observatory since 1921. He is a member of the National Academy of Sciences, the American Academy of Arts and Sciences, and of the Royal Astronomical Society at London.

Tickets for the lectures may be obtained free of charge by applying by mail to the Curator of the Lowell Institute, enclosing a stamped envelope for each ticket required.